Sentrly
Free privacy & security tools
Every tool below runs entirely in your browser. We never see what you type, paste, or generate.
Password Strength Checker
Estimate the entropy and crack-time of any password — entirely in your browser.
Password Generator
Create a strong, random password using your browser's secure RNG.
Passphrase Generator
Generate a memorable random word-based passphrase for your master credential.
Browser Privacy Snapshot
See exactly what your browser exposes to every website you visit.
Security Headers Explainer
Paste your site's response headers — get a plain-English breakdown of each one.
QR Code Generator
Generate a QR code from any text or URL — entirely in your browser.
Word Counter
Count words, sentences, paragraphs, and reading time as you type.
Character Counter
Count characters with and without spaces — useful for SEO meta tags and tweets.
URL Encoder / Decoder
Convert text to and from percent-encoded URL form, in your browser.
Base64 Encoder / Decoder
Encode text to Base64 or decode Base64 to text — locally.
Meta Title SERP Preview
See how your <title> tag looks in a Google search result, with character feedback.
Meta Description SERP Preview
Preview your meta description and check it fits in a search snippet.
Robots.txt Generator
Build a robots.txt with common rules, the right syntax, and your sitemap line.
VPN vs Proxy Decision Helper
Answer four questions; get a clear recommendation.
Why client-side?
A privacy tool that uploads your password to "check" it is the kind of contradiction that has burned millions of users. Every tool here computes its results in your browser using standard web APIs — including the platform's secure random source for any generator. Your input does not leave the page.
What's coming next
We're adding a haveibeenpwned-style range-prefix breach checker (privacy-preserving k-anonymity), a TOTP-secret QR generator, and a router-DNS test page. Subscribe below to know when each ships.